(CBS) — The Chicago White Sox have placed left-handed reliever Dan Jennings on the 15-day disabled list with inflammation on the left side of his neck.

In 22 relief appearances this season, the 28-year-old Jennings has a 1-2 record and 7.83 ERA

The White Sox have purchased the contract of Junior Guerra, 30, from Triple-A Charlotte. Guerra has gone 2-6 with a 2.72 ERA and 66 strikeouts in 49.2 innings between Double-A Birmingham and Charlotte.